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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A228329 a(n) = Sum_{k=0..n} (k+1)^2*T(n,k)^2 where T(n,k) is the Catalan triangle A039598.

Table of values

n a(n)
0 1
1 8
2 98
3 1320
4 18590
5 268736
6 3952228
7 58837680
8 883941750
9 13373883600
10 203487733020
11 3110407163760
12 47726453450988
13 734694122886080
14 11341161925265480
15 175489379096245984
16 2721169178975361702
17 42273090191785999728
18 657788911222324942060
19 10250564041646388681200

List of values

[1, 8, 98, 1320, 18590, 268736, 3952228, 58837680, 883941750, 13373883600, 203487733020, 3110407163760, 47726453450988, 734694122886080, 11341161925265480, 175489379096245984, 2721169178975361702, 42273090191785999728, 657788911222324942060, 10250564041646388681200]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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